[time-nuts] GPSDO diurnal variation

Bill Dailey docdailey at gmail.com
Wed Aug 1 00:27:58 UTC 2012

Does anyone have plots of true frequency variation of their 10 MHz standards over days?  I am trying to see if what I am seeing is typical or if I need to get a better antenna/gpsdo tuning/temp control.  Right now I am on vacation so am capturing data under much warmer than normal temps (ac turned down) and am seeing 250 uHz deviation with a period of about 24 hours (2.5x10-11).  I am trying to look at this in a way that is more intuitive and concrete to me than Allan deviation.  I am using a precision oscillator as the comparator and am removing linear drift (stochastic) in excel.  It seems surprisingly high.


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